The dangerous players from the world cup.
Every team have a couple of match winners  in their squad and the match winners can be batsman, bowlers or all rounder. I have select at least two players from each team.

From Pakistan
Shahid Afridi
Ability. He can destroy the opposition with spin bowling in in every conditions, he is also pinch hitter can score runs in good batting conditions.
Abdul Razzak
He also can swing his bat for runs and can score runs in every conditions he is also a wicket taker bowler too.

India
V Sehwag
A very reliable opening batsman and has a very good strike rate.
S Tendulkar
Tendulkar has a very good record in Tests and ODIs. He is highest run getter in tests and ODIs, double century in one day and highest number of centuries in tests and one day. He is also highest run getter in World Cups.

Australia
Punter
Has the ability to destroy oppositin with his bat, he is good finisher too.
Micheal Hussey
He is also known as Mr Cricket. he has the ability to fight back , he is clean hitter and and a very good finisher.

England
KP and James Anderson
KP is the back bone of English cricket and has the ability of power hitting, on the other hand Jimmy is the best medium pacer he is wicket taker.

South Africa
AB and Kallis
Kallis is the highest run getter for South Africa he is rock solid where as his partner(AB)  is aggressive. AB can bat in the humid condition of the subcontinent that makes him very special for South Africa.

West Indies
Chris Gayle
 Chris is very good all rounder. He is very good hitter and also lead from the front, he is the key for windies.

 New Zea land
 B McCullum & D Vettori
 Brendon and Vettori both are backbone of kiwi's, Vetori is very good with the ball and Brendon with the bat is awesome.

Sri Lanka
 Muralitharan & Jayawardene
 Muttiah is the leadind wicket taker in one days and tests. he can troubled every batsman where as Mahela is the most reliable batsman in lankan's lineup.